21111002099989 has 2 divisors, whose sum is σ = 21111002099990. Its totient is φ = 21111002099988.

The previous prime is 21111002099921. The next prime is 21111002100007. The reversal of 21111002099989 is 98999020011112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13054816791025 + 8056185308964 = 3613145^2 + 2838342^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111002099989 - 2²¹ = 21111000002837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111002099189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555501049994 + 10555501049995.

It is an arithmetic number, because the mean of its divisors is an integer number (10555501049995).

Almost surely, 2^{21111002099989} is an apocalyptic number.

It is an amenable number.

21111002099989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111002099989 is an equidigital number, since it uses as much as digits as its factorization.

21111002099989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 52.

The spelling of 21111002099989 in words is "twenty-one trillion, one hundred eleven billion, two million, ninety-nine thousand, nine hundred eighty-nine".